MODEL OF VOID FORMATION ON WEDGE DISCLINATION

A model of voids formation during plastic deformation is proposed, based on the concept of crack formation in the field of elastic stresses of a negative disclination and its subsequent blunting due to accommodative plastic deformation. A detailed analysis of the main characteristics of a disclination crack is carried out. Analytical expressions are obtained for the stress intensity factors at its tips, the distribution of the Burgers vector density and the profile of its opening depending on the material parameters and disclination characteristics. The stability conditions of a symmetric microcrack with a disclination located in its center are investigated. For this configuration of defects, the dependence of the value of plastic crack opening on the disclination strength, the elastic field screening radius and the mechanical constants of the material is obtained.